Angular displacement encoder with two magnetic tracks

US7119535B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Stefan Butzmann · Bünde, DE
• Stefan Pusch · Hamburg, DE
• Michael Hinz · Hamburg, DE
• Gunnar Schulz · Hamburg, DE
• Marcus Weser · Hamburg, DE
• Thomas Stork · Hamburg, DE

Key dates

• Filing date: Jun 13, 2003
• Grant date: Oct 10, 2006
• Expiry date: Nov 6, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D2205/80
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

What is described is a configuration for determining the position of a body along a movement direction, wherein the body is in the form of a magnetized encoder with two magnetic tracks extending, on one surface of the body, along the movement direction, at least essentially in parallel with one another, wherein, at specified intervals along the movement direction, a first of the magnetic tracks exhibits magnetized sections in which the magnetic north poles are aligned so as to be at least largely coincident in a magnetization direction that is essentially at right-angles to the surface of the body, and wherein, at intervals specified to coincide with the above-mentioned intervals along the movement coordinate, the second of the magnetic tracks exhibits magnetized sections in which the magnetic south poles are aligned so as to be at least largely coincident in the said magnetization direction, and wherein, in each case, a magnetized section of one of the magnetic tracks is located at least largely centrally in relation to a gap between two magnetized sections of the other magnetic track, with a magnetoresistive sensor, in the form of an angle sensor, which is arranged above the magn…